There are tons of nameless mummies in countless mummy movies, but some mummies are supposed to represent specific individuals. For instance, Imhotep was the main mummy in most of the Brendan Fraser mummy movies. Which character, historic or imagined, has the distinction of being personally identified as a "Mummy" in the most motion pictures?
It may be down to:
Imhotep, a real Egyptian chancellor/high priest, popularized as a mummy in Boris Karloff's The Mummy  and the more recent The Mummy  and The Mummy Returns - both with Brendan Fraser, or:
Kharis, a fictional character, who was featured by Lon Chaney in The Mummy's Tomb , The Mummy's Ghost , and The Mummy's Curse [also 1944]; he was also played by Christopher Lee in The Mummy .